Mold joe



C. L. MEYER AND R. 0. MACMONAGLE- MOLD FOR CONCRETE COLUMNS.

APPLICATION FILED MAR.29.'19|9 Patented Aug. 12, 1919.

IHiIIIHImHH UNITD STATES PATENT OFFICE.

CHARLES LOUIS MEYER AND BOY 0. MAGMONAGLE, OF OMAHA, NEBRASKA.

MOLD FOR CONCRETE COLUMNS.

Specification of Letters Patent.

Patented A11 12, 1919.

Application filed. March 29, 1913. Serial No. 286,122.

To all whom it may concern:

Be it known that we, CHARLES LOUIS hTEYER and For 0. MAcMoNAoLn. both citizens of the United States, residing at Omaha, in the county of Douglas and State of Nebraska, have invented certain new and useful Improvements in Molds for Concrete Columns, of which the following is a specification.

This invention relates to molds or forms for the erection of concrete and cement columns, and the invention consists in the novel construction and combinations of parts hereinafter described and defined in the claims.

The object of our invention is to provide an improved mold for use in the erection of concrete and cement columns that shall be simple and durable in construction, easy to assemble, and of low cost.

A. practical and approved embodiment of our invention is illustrated in the accompanying drawings, in which;-

Figure 1 is an elevation, broken off at its lower end. of our improved mold;

Fig. 2 is an enlarged cross-section taken on the line 22 of Fig. 1;

Fig. 3 is a fragmentary plan view showing the meeting ends of the hoop sections slightly separated;

Fig. l is a view of the parts shown in Fig. 3 as seen from the bottom of the latter; and

Fig. 5 is an enlarged sectional view through the longitudinal oint of one of the cylindrical mold sections.

Referring to the drawing, 5 designates as an entirety each of the cylindrical mold sections which in practice are superposed with the lower end of one telescoping for a short distance into the upper end of the next lower section; and 6 designates as an entirety the head of the mold which may be of any approved construction and with which the present invention is not concerned.

Each mold section 5 comprises a plurality (herein shown as a pair) of semi-cylindrical sheet metal sections 5 that are united by longitudinal joints that form the complete cylindrical section. The formation of the joint is best illustrated in the enlarged view, Fig. 5, wherein it will be seen that the metal on the longitudinal margin of one section is laterally off-set on the outer side of the cylinder to the extent of twice the thickness of the metal and is then folded twice on itself at 7 on the inner side of said off-set portion so as to form between the two inner folds a pocket 8 lying substantially in the curved plane of the cylinder and of just sufficient width to receive and fit the plain longitudinal marginal portion of the other semi-circular section. Of course, the mold section may be made from a single blank of sheet metal having but a single longitudinal split or joint if desired, but for manufacturing purposes the employment of a pair of semi-cylindrical sections is preferable.

Each section 5 is bonded transversely by one or more bands or hoops that preferably have the form and construction herein shown. Each of these hoops as shown comprises a pair of semi-circular sections 9 of T-form in cross section arranged with their bases lying against the circumferential wall of the cylindrical section 5. As shown in Figs. 3 and 4 one end of the base of each hoop section 9 is cut away for a distance inwardly, as shown at 10, and the projecting portion of the rib is formed with a transverse slot 11. The other end of each section, which constitutes the meeting end relatively to the end last described, has a portion of its rib cut away inwardly, as shown at 12, and to the said rib are riveted a pair of extension strips 13 that project some distance beyond the end of the base and are transversely slotted as shown at 14.

In assembling the two sections of the hoop or band, the projecting end of the rib of one section, which has the slot 11, is entered between the forward extensions of the strips 13, thereby bringing the slots 11 and 14 into register with each other. A wedge key 15 is then driven through said slots, thereby powerfully drawing together the hoop sections and exerting a strong clamping effect on the cylindrical mold section;

As many of these hoops or bands as are required may, of course, be used, depending somewhat upon the length of the individual cylinder sections and the strength of the sheet metal used in their construction.

As compared with known mold forms or molds of this character, the mold of our present invention is of very simple and economical construction and presents aminimum of parts necessary to provide a strong and efiicient structure of the character and for the purposes specified. Variations and modifications in respect to minor details may, of course, be made by those skilled in the art without departing from the substance of the invention or sacrificing any of the advantages thereof.

We claim:

1. A mold for a concrete column, comprising a plurality of superposed hollow sheet metal sections, each of said sections comprising a longitudinally split cylinder having the metal on one margin thereof laterally off-set on the outer side of the cylinder to the extent of twice the thickness of the metal and then folded twice on itself on the inner side of said offset portion, thereby forming a pocket lying substantially in the curved plane of the cylinder and receiving, the other margin of the cylinder, and bands or hoops embracing said sections.

2. A mold for a concrete column, comprising a plurality of superposed cylindrical hollow sections, and hoops embracing said sections, each of said hoops comprising a plurality of sections of T-form in cross section, the ribs of said sections at the meeting ends of the latter having transversely slotted overlapping extensions rigid therewith, and

Copies of this patent may be obtained for five cents each, byaddressing' the wedge keys driven through the slots of said extensions.

3. A mold for a concrete column, compris ing a plurality of superposed cylindrical hollow sections, and hoops embracing said sections, each of said hoops comprising a plurality of sections of T-t'orm in cross section, the end of one section having its base cut away for some distance back of the end of its rib and the projecting rib extension thus formed being transversely slotted, and the meeting end of another section having its rib cut away for some distance back of its base, a pair of strips riveted to opposite sides respectively of the rib of the lastnamed section and having transversely slotted extensions projecting beyond the base of said last-named section and receiving between them the projecting rib extension of said first-named section, and a wedge key driven through the slots of said extensions.

CHARLES LOUIS MEYER. ROY O. MAoMONAGLE.

Commissioner of Patents.

Washington, D. G. 

